title: Investigation on the adsorption characteristics of sodium benzoate and taurine on gold nanoparticle film by ATR-FTIR spectroscopy.
abstract: Fourier transform infrared (FTIR) spectroscopic studies of sodium benzoate and taurine adsorbed on gold nanoparticle (AuNp) film on silanised glass slides have been studied by attenuated total reflection technique (ATR). The surface morphology of the AuNp films has been measured by Atomic Force Microscopy. The ATR spectra of sodium benzoate and taurine deposited on AuNp film are compared with ATR spectra of their powdered bulk samples. A new red-shifted band appeared along with the symmetric and asymmetric stretches of carboxylate group of sodium benzoate leading to a broadening of the above peaks. Similar behavior is also seen in the case of symmetric and asymmetric stretches of sulphonate group of taurine. The results indicate presence of both chemisorbed and physisorbed layers of both sodium benzoate and taurine on the AuNp film with bottom layer chemically bound to AuNp through carboxylate and sulphonate groups respectively.
authors.affiliation: High Pressure & Synchrotron Radiation Physics Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India.
authors.forename: Naveen
authors.initials: N
authors.lastname: Kumar
authors.forename: S
authors.initials: S
authors.lastname: Thomas
authors.forename: R B
authors.initials: RB
authors.lastname: Tokas
authors.forename: R J
authors.initials: RJ
authors.lastname: Kshirsagar
mesh_terms: D000327:Adsorption; D006046:Gold / Q000737:chemistry; D053758:Nanoparticles / Q000737:chemistry; D020160:Sodium Benzoate / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared / Q000379:methods*; D013654:Taurine / Q000737:chemistry*
chemical_list: D013654:Taurine; D006046:Gold; D020160:Sodium Benzoate
keywords: ATR–FTIR; Adsorption; Gold nanoparticles; SEIRA